iso 100 and 400

[experiment]

Hi there, if i were to use a iso100 film for macro shots do i need to have a very sunny day in order to achieve good results? is it true that iso100 films give finer grain but require better lighting?

 

[enivre]

Erm... iso400 is 2 stops faster than iso100. So of course you need more light if you are shooting with iso100. Quite basic concept yah?

As to if it's a sunny day or not, that really depends on the situation and the subject. Eg. if it's windy, if your subject is in the shade, etc etc etc...

 

[DeSwitch]

There is something called Flash. I shoot at ISO100 during our night macros.

 

[fuwen]

Hi there, if i were to use a iso100 film for macro shots do i need to have a very sunny day in order to achieve good results? is it true that iso100 films give finer grain but require better lighting?

The answer should be yes, but there will be many occasions that u will need to play with flash. For flash I prefer bounce card then direct. And for macro I feel that ASA100 is a better bet.

BTW rangefinders are not very ideal for macro shots.

 

[OpenLens]

There is something called Flash. I shoot at ISO100 during our night macros.

One would assume that he will not be using a macro lens considering this is posted in the RF forum. There's a good chance that he won't be using a flash, either.

To try and help answer your question:

ISO 100 film will give you an exposure of about 1/125@f8 in the open on a sunny day. Drop that down 2 stops for outdoor shadow areas (i.e. 1/60@f5.6). Well-lit indoors will be about the same (1/60@f4-5.6). Evening and nighttime shots, photos on very overcast days or during bad weather, and indoors under normal or poor lighting are not hand-holdable.

ISO400 film can give you hand-holdable shots at night on city streets thanks to all the ambient lighting...maybe 1/30s @f2-4. You'll also get hand-holdable shutter speeds on bad-weather days and indoors.

 

[centurion_sg]

Assuming you have a basic understanding of the relationship between film speed, exposure time, and aperture size, then the question would be about what's important for your picture? Is the fine grain necessary because you're blowing up the picture? There's also the color saturation difference between ISO100 and 400, if using color films. Sunny days may not make good pictures too as it may mean harsh shadows.

Hi there, if i were to use a iso100 film for macro shots do i need to have a very sunny day in order to achieve good results? is it true that iso100 films give finer grain but require better lighting?